Numerical analysis of pile behaviour under lateral loads in layered elastic–plastic soils

Published on Dec 10, 2002in International Journal for Numerical and Analytical Methods in Geomechanics4.264
· DOI :10.1002/NAG.250
Zhaohui Yang16
Estimated H-index: 16
(UC Davis: University of California, Davis),
Boris Jeremić20
Estimated H-index: 20
(UC Davis: University of California, Davis)
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Abstract
SUMMARY This paper presents results from a flnite element study on the behavior of a single pile in elastic{plastic soils. Pile behavior in uniform sand and clay soils as well as cases with sand layer in clay deposit and clay layer in sand deposit were analyzed and cross compared to investigate layering efiects. Finite element results were used to generate p i y curves and then compared with those obtained from methods commonly used in practice.
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#1Boris Jeremić (UC Davis: University of California, Davis)H-Index: 20
#2Zhaohui Yang (UC Davis: University of California, Davis)H-Index: 16
In this paper we present a new approach to computations in elasto-plastic geomechanics. The approach is based on the object oriented design philosophy and observations on similarity of most incremental elastic–plastic material models. This new approach to elastic–plastic computations in geomechanics allows for creation of template material models. The analysis of template material models will in turn allow for an easy implementation of other elastic–plastic material models based on the object or...
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The coupled bridge foundation-superstructure finite-element code FLPIER was employed to predict the lateral response of the single piles and 3 × 3 to 7 × 3 pile groups founded in both loose and medium dense sands. The p-multiplier factors suggested by McVay et al. for laterally loaded pile groups with multiple pile rows were implemented for the predictions. The soil parameters were obtained through a back-analysis procedure based on single pile test results. The latter, as well as the numerical ...
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#1Akihiko Wakai (Gunma University)H-Index: 10
#2Shingo GoseH-Index: 2
Last. Keizo UgaiH-Index: 23
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This paper is a study based on a number of model tests of free- or fixed-headed pile groups, each composed of nine piles, subjected to lateral loading. The model piles made of aluminum were set in dry sand and laterally loaded. The behaviors of the pile groups were then analyzed by the 3-D elasto-plastic finite element method (FEM), which represents a realistic model to simulate the problem. This model includes elasto-plastic soil behavior with no-tension characteristics, as well as thin frictio...
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An apparatus was developed to load large pile groups (3 × 3 to 7 × 3) founded in sand in the centrifuge laterally. The device consists of a hydraulic jack apparatus to install the piles, strain gauge instrumentation, and a data acquisition system. The instrumentation allowed the determination of both bending moments and shear forces at the head of each pile. Lateral load tests of 3 × 3 to 7 × pile groups were conducted in both loose and medium dense sands. Based on the test results, the pile gro...
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The main objective of this work is to examine the effect of nonlinear soil behavior on the axial and lateral response of piles to monotonic and cyclic loading with a view towards developing simplified, yet realistic models for representing pile‐soil‐pile interaction effects. The specific role of pile‐soil slippage and separation, and the overall nonlinear soil behavior on the response of single piles and pairs of piles is studied by means of a three‐dimensional finite element elastoplastic model...
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#1Dan A. Brown (AU: Auburn University)H-Index: 12
#2Chine-Feng Shie (AU: Auburn University)H-Index: 4
Abstract This paper describes the results of several numerical experiments performed with a three dimensional finite element model of a laterally loaded pile. The experiments are used to investigate the effect of several factors on the p-y curves derived from the model. The three dimensional finite element model utilizes a plasticity model for soil with interface elements which allow gap formation; the model has been described by Brown and Shie (1). P-y curves are widely used in design because o...
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#1Dan A. Brown (AU: Auburn University)H-Index: 12
#2Chine-Feng Shie (AU: Auburn University)H-Index: 4
The behavior of a pile subjected to lateral loading has been analyzed using a three dimensional finite element model. The study represents an attempt to develop a reasonably realistic model of the problem, including gap formation and plastic deformations in the soil around the pile, so as to provide 3 basis for parametric studies of the effects of pile spacing, pile head fixity, and soil stiffness on pile response. Constitutive models for soil include a simple elastic-plastic model with a Mises ...
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#1Dan A. Brown (AU: Auburn University)H-Index: 12
#2Chine-Feng Shie (AU: Auburn University)H-Index: 4
Abstract The response of closely spaced piles subjected to lateral loading in either one or two rows has been analyzed using a three dimensional finite element model. This research is an extension of the work described in reference (7), which describes the finite element model and the response of a single pile to lateral loading. The model utilizes two types of plasticity models for soil to represent either undrained loading of saturated clay or drained loading of sands. Additionnally, frictiona...
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Solutions are presented for the non linear load settlement behaviour of square configuration pile groups. The groups are represented by an equivalent axially symmetric model, and a non linear finite element is used to examine the mechanisms of group behaviour and their variation with pile spacing. It is shown that, at close spacings, the block failure mechanism occurs, with significant plastic zones being developed below the group and full pile soil slip only being developed along the outer pile...
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A non-linear three-dimensional finite element procedur is developed and applied for the analysis of pile group foundations. The numerical procedure allows for elastic, non-linear elastic and elastic-plastic hardening behaviour of sand. In order to include the interaction effects involving relative slip and debonding, the thin-layer interface element is used. The predictions for displacements and loads obtained from the numerical procedure are compared with laboratory model test results of a pile...
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This paper focuses on a numerical approach to finding the p–y curves for laterally loaded piles. The Drucker–Prager plastic model is employed and implemented within a finite element MATLAB code. The pre- and post-processing code for Gmsh and related numerical tools are established as well. The p–y curve results from this new approach have been validated and compared to the typical design equations of API (American Petroleum Institute) and Matlock. The validation reveals that the code leads to lo...
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#1A. Ghasemipanah (IKIU: Imam Khomeini International University)H-Index: 1
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Pile foundations are often exposed to vertical and lateral loads. In common pile analysis, it is assumed that the effect of these two load types do not depend on each other, and designing is usually done individually for each of the vertical and lateral loads. The influence of vertical load on the response of the pile lateral load can be extracted via finite element analysis in a variety of soils. AllPile is a commercial program that has been utilized in many executive tasks and because of its e...
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Unlike the bearing and uplift capacities of under-reamed pile, the lateral resistance of under-reamed pile is studied by a very few researchers. Therefore, in the present study, a three-dimensional numerical analysis is carried out to study the response of under-reamed pile in clay under lateral loading. In the numerical analysis, various parameters such as embedment length to shaft diameter ratio (Lu/D), top bulb distance from the base to bulb diameter ratio (hb/Du), undrained cohesion (cu), ra...
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Abstract This paper investigates the time-dependent response of laterally loaded single piles and pile groups embedded in transversely isotropic saturated viscoelastic soils. The solution for single piles subjected to lateral loads is solved by the coupling of the boundary element method and the Timoshenko beam theory. In the analysis of the pile group, the interaction between piles is taken into account and the generalized displacements caused by all piles are obtained by superimposing the infl...
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#1Lidija Zdravković (ICL: Imperial College London)H-Index: 31
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The PISA project was a combined field testing/numerical modelling study with the aim of developing improved design procedures for large diameter piles subjected to lateral loading. This paper descr...
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#1Tanumaya Mitra (Indian Institute of Engineering Science and Technology, Shibpur)H-Index: 1
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In this present study, a Beam on Nonlinear Winkler Foundation approach has been utilized to study the effect of ground improvement on deformation characteristics of laterally loaded pile. Fourth-order governing differential equation of pile deformation has been solved, and a simplified pile–soil stiffness matrix has been developed. The optimum depth (from ground surface) up to which engineering properties of soil require to be improved has been ascertained using a computer code developed in MATL...
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